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A waveguide-type leaky wave antenna with periodical slots is proposed. The beam can be scanned at a single frequency by switching diodes connected to the slots. A combination of the slots is excited selectively so as to make a beam to a desired direction. By changing the combination the beam can be scanned discretely from 60 deg. to 120 deg. Measured radiation patterns agree with theoretical predictions...
A two-dimensional negative index material is proposed. It has volumetric structure composed of dielectric cylinders with a metal pattern arranged in the form of a hexagonal lattice. Simulation results show that the material has small anisotropy. By using the second LH mode a plane wave goes into the material with low reflection through a transformer. The material is fabricated for an experiment of...
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